I currently suffer from a lack of ample time to explain the rather vast list of salutes/physical addressals exhibited amongst the Ancient Iranians; Some of them submissive, some with religious impact, and some purely formal means of salutations. It all ranges from proskynesis (προσκύνησις), to the Parthian-style salute (Erkâs - Simply an open right hand in a non-elaborate but polite gesture) and later Sassanian salute (Erkâs - Respectfully with hand[s] under the armpit[s]). Religious salutations may be the pointed index finger, coined by the Zoroastrian chief Môbêd, Kârtîr. I can dig up a few photos at some other time.

It is hard to imagine Partho-Sassanians, for all their renown and cosmopolitan nature would lack a physical means of formal greeting